Justin Bieber: Being a child star 'the toughest thing'

Justin Bieber believes being a child star "is the toughest thing in the world".

The 21-year-old star got signed to Island Records aged 14, releasing his debut album 'My World 2.0' two years later, and has admitted he really struggled to deal with being famous at such a young age.

He said: "I wouldn't suggest being a child star. It's the toughest thing in the world."

Looking back at his own experiences and knowing other young stars, the 'Sorry' hitmaker can understand how fame can negatively affect teenagers and supported his pal Kylie Jenner, 18, who he thinks has been "affected" by what people think of her.

He explained to Billboard magazine: "I want people to be more kind to young celebrities.

"Like Kylie [Jenner]. Look at her world: She has been living on TV since she was a kid. Every time she's looking around she sees a camera, and that's affecting how she's thinking and how she's perceiving people and why she has to do certain things ... Situations that happen taint your mind, especially in this industry. Especially for girls. I hurt for some people.

"Everything is so [based] on people's looks and stuff ... Look at the statistics on how many child stars have crumbled and turned out to be wack jobs. It's because - it's f**ked, bro, this lifestyle."